Resonant x-ray scattering study on electronic hybridization in unconventional ordered phase of PrRu4P12

PrRu4P12, which undergoes a metal-insulator transition at T-MI similar to 63 K, has been investigated by resonant x-ray scattering technique at the Pr L-3-edge, the P K-edge, and the Ru L-3-edge, in which element and orbital selective electronic states can be clarified. Resonating energy spectra at the 111 reflection were found at the Pr L-3-edge and P K-edge, while it was not observed at the Rh L3-edge. This is the first observation of quite large resonant signal at the P K-edge. This result is considered as a direct evidence for the strong Pr 4f and P 3p hybridization effect on the unconventional ordered phase accompanied by the insulator state.